Audi Q5 8R A5 8T A4 8K Rear Diff Differential Code KCC 43/13 0BC500043J WARRANTY

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order.

Audi Q5 8R A5 8T A4 8K Rear Diff Differential Code KCC 43/13 is a factory-original drivetrain component designed for installation on the rear axle of selected Audi models. Offered within the Differentials category, this unit ensures proper torque distribution between the wheels, resulting in stable handling and predictable vehicle behavior. This is an ideal solution for users seeking a proven, used component built to the manufacturer's exact specifications.

Specifications and technical data

• SKU: 0BC500043J-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 0BC500043J
• Substitutable numbers: 0BC500043J, 0BC 500 043 J
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function of the rear differential

The presented rear axle is a drivetrain component responsible for transferring torque from the driveshaft to the rear wheels and compensating for the difference in rotational speed between them. In vehicles such as the Audi Q5 8R, A5 8T, or A4 8K, this is crucial for:

• maintaining traction during acceleration and cornering,
• limiting wheel slip on surfaces with varying grip,
• preserving driving stability at higher speeds.

Thanks to the correctly selected gear ratio, the differential also influences the drivetrain's performance characteristics – throttle response, operational smoothness, and the loads transferred to other drivetrain components.

Construction and performance parameters

The rear axle from this offer belongs to the Differentials group, meaning it is a complete gear assembly designed for installation in the rear of the vehicle. Its construction, based on a final drive with a specific gear ratio, ensures:

• consistency with the factory drivetrain characteristics of the given Audi model,
• proper integration with the stock transmission and vehicle electronics,
• appropriate load distribution within the drivetrain.

The vehicle placement specified as rear clearly indicates that the component is intended for installation in the rear of the chassis, on the driven axle. This is essential when selecting parts for two-wheel drive vehicles or all-wheel drive systems, where each axle has a specific assigned position.

Application in Audi models

The differential has been designed for platforms used in the Audi Q5 8R, A5 8T, and A4 8K models, allowing for factory-perfect fitment with the suspension geometry and drivetrain. In practice, this means:

• correct mounting points for the subframe and suspension components,
• compatibility with stock half-shafts and the driveshaft,
• no need for modifications to the chassis during installation.

For users replacing a damaged rear axle or matching the gear ratio to a specific vehicle configuration, this component provides a technically consistent solution that minimizes the risk of compatibility issues.

Condition characteristics and benefits of choosing a used differential

The offered differential is a used component, which in practice represents a favorable compromise between cost and maintaining the manufacturer's original design. Compared to low-quality aftermarket replacements, a factory rear axle from disassembly ensures:

• preservation of the original drivetrain performance characteristics,
• consistency with factory settings of control units and assistance systems,
• the possibility of economical repair without sacrificing original Audi technology.

For workshops and individual users, this is a solution that allows for the efficient replacement of a damaged part while maintaining high vehicle functionality.

Gear ratio selection and additional technical materials

When replacing the rear axle, it is crucial to match the gear ratio to the existing drivetrain configuration and the driver's driving style. Proper selection affects dynamics, fuel consumption, and mechanical stress throughout the system. If you want to deepen your knowledge regarding the practical selection of drive axles and differentials, how to verify gear ratios, and typical configurations used in various models, it is worth reading the article: Drive axles and differentials from disassembly – how to choose gear ratios for your driving style.

If you are planning a comprehensive repair or upgrade of your Audi's drivetrain and need other components from the same group, such as additional axles, differentials with different gear ratios, or compatible gear assemblies, check out the available parts in the Audi Differentials category.